USPC 416/120

USPC 416/120 is a category of technologies in patents.

PLURAL IMPELLERS HAVING RELATIVE MOVEMENT OR INDEPENDENT SUPPORTS . . . Apparatus comprising two impellers* which are independently supported* or which move relative to one another during use. (1) Note. Movement of one impeller relative to another comprises (1) different impelling movement (e.g., rotation in the opposite direction, in the same direction at variable speeds, or positive drive of one and free rotation of another), (2) relative pitch* adjustment, or (3) moving one impeller closer to or away from another impeller by means other than mere adjustment of securing means for the impeller. (2) Note. Synchronizing means for a plurality of motors driving individual impellers is in Class 318, Electricity: Motive Power Systems, subclasses 41+ where the motors have synchronizing interconnections, and subclass 85 where the motors have a synchronizing or phasing control; a synchronizer for plurality of shafts is in 361, Electricity: Electrical Systems and Devices, subclasses 243+ and a synchronizer for a plurality of nonelectrical motors is in Class 60, Power Plants, subclasses 700+.

SEE OR SEARCH THIS CLASS, SUBCLASS: 33+, for apparatus having plural distinct impellers with an interrelated control actuated by (1) means sensing a noncyclic condition, (2) centrifugal force, or (3) torque or thrust. 198+, for plural impellers which are axially spaced on the same support* and which are not relatively movable.

SEE OR SEARCH CLASS: 60, Power Plants, subclasses 700+ for synchronizing of plural motors, and see (2) Note above. 74, Machine Element or Mechanism, subclasses 640+ for gearing with impellers recited by name only, and subclasses 665+ for gear mechanisms for driving a plurality of impellers from a single driving means, and see (2) Note above. 244, Aeronautics and Astronautics, subclass 17.23 for plural gyroplane rotors combined with significant vehicle structure; subclass 55 for the arrangement of two or more power plants on an aircraft where more structure than that is necessary to mount the power plants is claimed; and subclass 65, for two or more impellers mounted on an aircraft where more structure than that necessary to mount the impellers is claimed. 318, Electricity: Motive Power Systems, subclasses 41+ and 85, and see (2) Note above. 361, Electricity: Electrical Systems and Devices, subclasses 243+ for electrical synchronizers for rotary shafts and see (2) Note above. 440, Marine Propulsion, subclasses 79+ for ships having multiple screw propellers. 475, Planetary Gear Transmission Systems or Components, appropriate subclasses, for planetary gearing to drive plural load devices.

Definition of impeller:

A device comprising at least one working member which functions to react with a working fluid such that action movement of the member causes reaction movement of the fluid or action movement of the fluid causes reaction movement of the working member. In its simplest form, a single impeller is considered to comprise a working member or members and any parts rigidly connected therewith whereby the impeller is supported for movement. In the case of an impeller having a working member which has relative movement with respect to another impeller part or another working member, the definition of impeller is considered to include those mechanical elements which permit or cause relative motion of the working members and at least partly partake of the motion of the working member and are closely associated therewith to form a unitary device having a unitary impelling function. [An impeller may have many impediments.] In most cases it will be apparent which elements [form] the impeller and which elements [make up] support* means for the impeller of means for transmitting power to or from the impeller. In those subclasses in which the precise limits of the impeller, per se, are apt to be troublesome, an effort is made to define the impeller concept in more detail insofar as it concerns the concept of the particular subclass.

Nearby class tree:

• USPC 416/120 PLURAL IMPELLERS HAVING RELATIVE MOVEMENT OR INDEPENDENT SUPPORTS: Apparatus comprising two impellers which are independently supported or which move relative to one another during use. Movement of one impeller relative to another comprises (1) different impelling movement (e.g., rotation in the opposite direction, in the same direction at variable speeds, or positive drive of one and free rotation of another), (2) relative pitch adjustment, or (3) moving one impeller closer to or away from another impeller by means other than mere adjustment of securing means for the impeller. Synchronizing means for a plurality of motors driving individual impellers is in USPC 318/41+ (electric motive power systems) where the motors have synchronizing interconnections, and USPC 318/85 where the motors have a synchronizing or phasing control; a synchronizer for plurality of shafts is in USPC 361/243+ and a synchronizer for a plurality of nonelectrical motors is in USPC 60/700+.
  • USPC 416/121 Shiftable support. Apparatus wherein the support for at least one of the impellers is movable as a whole to a different operative position relative to (1) at least one other impeller or (2) a common support for the plural impellers (e.g., vehicle body). The movement does not include that relative movement of a support which is inseparable from normal impeller operation (e.g., reciprocating or eccentric shaft), nor is a mere mounting adjustment or tiltable carrier* included.
  • USPC 416/122 Impellers which take intersecting or interdigitated paths
  • USPC 416/123 Divergent rotation axes. Apparatus in which the impellers have a common support and rotate about axes which are angular on skew to one another. See USPC 244/17.11+ , particularly subclass 17.21, for plural impellers having divergent axes and combined with significant aircraft structure.
  • USPC 416/124 Coaxial rotation. Apparatus wherein the plural impellers are supported for rotation about a common axis.
    • USPC 416/125 Individual prime mover. Apparatus wherein the impellers are each driven by a separate power sources.
    • USPC 416/126 Concentric working members. Apparatus wherein the coaxial impellers rotate one inward of the other on the same radial plane.
    • USPC 416/127 Concurrent adjustment. Apparatus in which the coaxial impellers are arranged to be adjusted simultaneously by positive means. See USPC 416/128+, for oppositely rotating "free blade" impellers in which an adjustment caused by aerodynamic forces may or may not be simultaneous.
    • USPC 416/128 Oppositely rotating impellers, sharing an axis
      • USPC 416/129 Engine driven. Apparatus comprising a source of mechanical power rotating the plural impellers.
  • USPC 416/130 Differential or independent adjustment. Apparatus wherein one impeller is adjusted unequally or separately with respect to another. See USPC 416/127 for plural impellers having coaxial axes of rotation and comprising means for adjusting the impellers concurrently, but which may be a differential adjustment.

References

Enclosing categories	USPC 416
Subcategories	USPC 416/123, USPC 416/121, USPC 416/122, USPC 416/124
Keywords	Propulsion, Propeller
Start year
End year